RHYNCHOCYCLUS. . 9 
similar range in altitude in Costa Rica and the more western parts of the State of 
Panama. 
The nest of R. brevirostris has not been discovered; but Salmon describes the eges 
of &. fulvipectus, which he met with at Frontino, in the valley of the Atrato, as white 
with an indistinct zone of small, very pale-red spots. 
2. Rhynchocyclus equinoctialis. 
Cyclorhynchus equinoctialis, Scl. P. Z. 8. 1858, p. 70°. 
Rhynchocyclus equinoctialis, Cab. & Heine, Mus. Hein. ii. p. 56°; Lawr. Ann. Lyc. N. Y. vii. 
p. 473°; Scl. & Salv. P. Z.S. 1864, p. 359*; Scl. Cat. Birds Brit. Mus. xiv. p. 166°. 
Cyclorhynchus brevirostris, Lawr. Aun. Lyc. N. Y. vii. p.329 (nec Scl.)°; Cassin, Pr. Ac. Phil. 1860, 
p. 1447. 
Preecedenti similis, alarum tectricibus pallido-olivaceo distincte limbatis, abdomine quoque pallidiore flavo, 
distinguendus. (Descr. maris ex Lion Hill, Panama. Mus. nostr.) 
Hab. Panama, Lion Hill (M‘Leannan?+°), Chepo (Arcé), Truando R. (Wood 7).— 
Eastern Ecuapor ! 25, 
The bill of £. equinoctialis is usually larger than that of R. brevirostris, but so much 
variation is found in this respect in the latter species that this character becomes 
untrustworthy. The two forms can with more certainty be distinguished by the greater 
definition of the edging of the wing-coverts and by the paler colour of the abdomen. 
The distribution of this species is somewhat remarkable, for, as far as our present 
knowledge goes, there is a wide gap in its range. We have no record of its occurrence 
between Eastern Ecuador and the Isthmus of Darien, yet specimens from these widely 
separated places present no tangible points of difference. 
Nothing has been recorded of the habits of this species, which inhabits the dense 
forests of the eastern side of the Isthmus of Panama, at a slight elevation above the 
sea-level, and the slopes of the Andes a few thousand feet above the sea. 
3. Rhynchocyclus sulphurescens. 
Platyrhynchus sulphurescens, Spix, Av. Bras. ii. p. 10, t. 12. f. 17. 
Rhynchocyclus sulphurescens, Cab. & Heine, Mus. Hein. ii. p. 56’; Sel. Cat. Birds Brit. Mus. xiv. 
p. 168°. 
Cyclorhynchus sulphurescens, Lawr. Ann. Lyc. N. Y. vii. p. 473+. 
Rhynchocyclus flavo-olivaceus, Lawr. Ann. Lyc. N. Y. viii. p. 8°; Scl. & Salv. P. Z. S. 1864, p, 359°; 
Salv. P. Z. S. 1867, p. 148’, 1870, p. 198°; Ibis, 1885, p. 295°. 
Cyclorhynchus cinereiceps, Lawr. Aun. Lyc. N.Y. vii. p. 829”. 
Rhynchocyclus marginatus, Lawr. Pr. Ac. Phil. 1868, p. 429”. 
Supra olivaceo-viridis; capite summo cinereo lavato; loris et oculorum ambitu albidis; alis fuscis flavo- 
olivaceo limbatis; cauda fusca dorsi colore extrorsum limbata: subtus sulphureo-flavus; pectore et 
hypochondriis olivaceo tinctis; gula paulo cinerascentiore; subalaribus sulphureis: rostri maxilla nigra, 
mandibula pallida; pedibus corylinis. Long. tota 52, ale 2-7, caude 2°3, tarsi 0°8, rostri a rictu 0°65. 
(Descr. maris ex San Pablo, Panama, Mus. nostr.) 
9 mari similis. 
BIOL. CENTR.-AMER., Aves, Vol. II., December 1888. 2 
